Tidal Flat Parasequence

Shown below are one complete parasequence and parts of two additional
parasequences, all developed along on a tidal flat. At the 1.5 meter high
jacob staff at the bottom, note the upward-thinning of the sandstone beds,
ultimately ending in a thick mudstone facies, demonstrating that although
most parasequences are shallowing-upward, not all are necessarily
coarsening-upward. The flooding surfaces at the base and top of this
parasequence are indicated by the yellow lines. This photograph was taken
in the Ordovician Juniata Formation near Germany Valley, West Virginia.